| Acronym | Meaning |
| TDM | Truncated Diagonalization Method |
| SNUR | Significant New Use Rule |
| RIGS | Radioimmunoguided Surgery |
| MLCFA | Maximum Likelihood Common Factor Analysis |
| DSCEMS | Depth Selective Conversion Electron Moessbauer Spectroscopy |
| ECP | Effective Core Potential Approxn.(in Electronic-structure Calcn.) |
| SRS | Symmetrized Rayleigh-Schroedinger (perturbation Theory) |
| WDXRF | Wavelength Dispersive X-Ray Fluorescence |
| USDA | United States Department Of Agriculture |
| NTD | Neutron Transmutation Doping |